Brake-shoe



W. GIBSON. BRAKE SHOE. APPLICATION HLED JULY'IB, I919.

Patented Aug. 10, 1920.

Wifwessas: 2 [1 2 6: 17211.92:

WILLIAM GIBSON, or PITTSBURGH, PENNSYLVANIA.

BRAKE-SHOE.

Specification of Letters Patent.

Patented Aug. 10, 1920.

Application filed July 18, 1919. Serial No. 311,848.

To all whom it may'concem:

Be it known that I, WILLIAM GIBsoN, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Brake- Shoes; and I do hereby declare thefollowing to be a full, clear, and exact description thereof. 7

My invention relates to brake-shoes and has special reference to that class of brakeshoes known as filled shoes, in which the braking portion is formed of a body or filling of frictional material for engagement with the wheel and is inclosed in a casing generally formed of metal.

The object of my invention is to provide a cheap, simple and efficient form of a filled brake-shoe in which such inclosing casing is formed entirely of a suitable soft material, which will have a lesser wearing quality than the wheel engaged by such filler or body and thereby prevent any wear or injury to the tread of such wheel through contact of such casing with the wheel or any melting of the casing caused by such contact when used with wheels on high speed passenger trains. A further object is to provide a simple form in one piece, instead of the known devices made in two or more parts.

To these ends my invention consists, generally stated, in the novel arrangement, construction and combination of parts, as hereinafter more specifically set forth and described and particularly pointed out in the claims.

To enable others skilled in the art to which my invention appertains to construct and use my improved brake-shoe, I will descrlbe the same more fully referring to the accompanying sheet of drawings, in which: I

Figure l is a plan or back view of my 1mproved brake-shoe;

Fig. 2 is a side elevation of the same;

Fig. 3 is a longitudinal central section of the same on the line 3-3 Fig. 1, looking in the direction of thearrows;

Fig. 4 is a bottom plan View of the shoe;

Fig. 5 is an end view of the same; and

Fig. 6 is a cross-section of the same on the line 66 Fig. 2, looking in the direction of the arrows.

Like symbols of reference herein indicate like parts in each of the figures on the sheet of drawings.

As illustrated in the sheet of drawings my improved brake-shoe shown at a is of the usual shape and curvature for such filled shoes and comprises an inclosing casing l and a frictional body or filling member 2 of frictional material inserted within such casing. The inclosing casing 1 for the filling member 2 consists of a cap 3 formed of a suitable relatively softer material which is provided with an integral back wall 4, side lips or walls 5 and end walls 6. What is commonly known as vulcanized fiber has been found a satisfactory material in practical use.

The casing 1 to form the cap 3 is pressed or stamped in any suitable manner or by any suitable means to provide the integral parts, such as the back 4., side walls 5 and end walls 6 above mentioned and the hollow portion 7 between the same for, the reception of the filling material 2, and by the same operations the usual bearings 8 having recessed portions 8 are on such back adjacent such end walls, as well as the corrugations 9 within said side walls.

The usual supporting lug 10, by means of which the brake-shoe a is connected to the usual brake-head or hanger (not shown) is fixed to the back 4 of the casing l in any suitable manner, such as by having its ends 11 passed through slots 12 in suchback and bent against the under side of the back. The usual central or intermediate hearings on the head or hanger'are adapted to abut against the back at and on each side of the lug 10.

In the formation of the brake-shoe a, after the cap 3 comprising the casing l is formed, with the lug 10 connected to the back 4 in any suitable manner, the filling material for the member 2 is inserted into the bottom portion 7 of the cap in any suitable manner and built up to the shape and depth desired to form the finished shoe (1 This frictional filling member 2 is adapted to engage with the wheel and the rubbing or frictional action of the brake-shoe upon the wheel is exerted by such frictional member, which consists of any suitable material, such as cast iron, or composition of matter or other material secured within the casing 1 to exert proper and suflicient friction upon the periphery of the wheel ,without the imposition of undue or excessive wear thereon and the loss of wheel metal,and such compositions are of a character familiar to those skilled in the art. 3

V In the use of the term soft in the above specification and claims it will be under; stood that the material used for the inclosing casing 1, will be flexible and resilient, and is of such a nature as to be -worn 'away itself by. friction, rather than cause the wearing away of the wheel to which the brakeshoe is applied, while such term also includes such materialwhich will not melt from the heat of such wheel on high speed passenger trains and thereby form a tempered or hard material as will tend to cut into and injure such wheel when the shoe or rather the filling material 2 is worn down to such casing; It. hasbeen found that the same raw stock as the regular vulcanized fiber when properly treated and pressed or formed to shape will answer the purposes desired.

It will thus be seen that my improved brake-shoe will prevent any possibility of the uneven wearing of the wheel throat, and will also enable the filling and sides and even the ends of the shoe to wear down evenly, uniformly and together, while such form of shoe will avoid any excessive wear on'the wheel by the sides or ends of the shoe and enable a strong and durable casing to be formed for the filling material.

Various modifications and changes in the design and construction of my improved brake-shoe may be resorted to, without departing from the'spirit of the invention or sacrificing any of its advantages.

What I claim as my invention and desire to secure by Letters Patent is 1. A brake-shoe having an inclosing casing and a filling material, said casing being provided with walls of soft material integral therewith.

2. A brake-shoe having an inclosing casing and a filling material, said casing being ing composed of ing and a filling material, said casing being composed of a soft materialand provided with integral walls. V

6. A brake-shoe having an inclosing casing and a filling material, said casing being of a soft material and provided with integral Walls having corrugations therein.

1 TVA brake-shoe having an inclosing casing and a filling material, said casing'being composed of vulcanized fiber and provided with an integral back, side and end walls.

'8. A brake-shoe having an inclosing casand a filling material, said casing being composed of vulcanized fiber and provided with an integral back and side walls.

9. A brake-shoe having aninclosing casing and a filling material,- said casing being composed of vulcanizedfiber and provided withan integral back and end walls. 7

'10. A brake-shoe having an inclosing casing and a filling material, said casing being composed of vulcanized fiber and provided with integral Walls.

11. A brake-shoe having an inclosing casing and a filling material, said casing being vulcanized fiber and provided with integral walls having corrugations therein.

In testimony whereof I, the said WI LIAM GIBsoN, have hereunto set my hand.

. WILLIAM GIBSON. Witnesses: Y J. N. Coonn,

J. M. GEOGHEGAN. 

